There are several differences and similarities between DNA and RNA. Which of the

Question

There are several differences and similarities between DNA and RNA. Which of the following statements is false?

Choose one answer.

(a) DNA has a pentose sugar, fructose, while RNA has a pentose sugar, ribose.

(b) The nitrogenous bases of DNA are adenine (A), thymine (T), cytosine (C), and guanine (G): the nitrogenous bases of RNA are adenine (A), uracil (U), cytosine (C), and guanine (G).

(c) DNA forms a two-stranded double helix, while RNA is usually single stranded.

(d) Both DNA and RNA are nucleic acids.

None of the above, all the statements are true.

Explanation / Answer

(a) DNA has a pentose sugar, fructose, while RNA has a pentose sugar, ribose. The main difference between DNA and RNA is the sugar present in the molecules. While the sugar present in a RNA molecule is ribose, the sugar present in a molecule of DNA is deoxyribose. Deoxyribose is the same as ribose, except that the former has one more OH.

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